Altimeter issue

[Cfpdscott]

anyone else have issues getting an accurate elevation readout? I constantly have to keep resetting mine to the correct elevation (around 500 ft). It fluctuates all over
The place I've seen as low as 70 feet and as high as 2000 feet and it hasn't moved out of my garage. Does this effect the performance of the sled as well?

 

[cannondale27]

anyone else have issues getting an accurate elevation readout? I constantly have to keep resetting mine to the correct elevation (around 500 ft). It fluctuates all over
The place I've seen as low as 70 feet and as high as 2000 feet and it hasn't moved out of my garage. Does this effect the performance of the sled as well?

I dont believe it effects engine operation. Others believe it does. I will do a test or you can. Disconnect the MAP sensors. Both of them. See what happens to reading. If nothing then Altimeter is just in guage itself and surely does not effect engine at all. If it does then its more complicated. As a example O2 sensor. It did not do anything in our sleds at least nothing my AFR guage could read. Maybe the same with the MAP sensor used for Altimeter. Thats atmospheric pressure. The other MAP sensor reads at intake. Thats engine and Atmospheric and is far more important for engine operation. We would need someone like TD or Evo to look at the programing of ECU and the map associated with that sensor to know if it has an effect and at what point it does. I asked them all and they are not into doing that.

 

[Cfpdscott]

I dont believe it effects engine operation. Others believe it does. I will do a test or you can. Disconnect the MAP sensors. Both of them. See what happens to reading. If nothing then Altimeter is just in guage itself and surely does not effect engine at all. If it does then its more complicated. As a example O2 sensor. It did not do anything in our sleds at least nothing my AFR guage could read. Maybe the same with the MAP sensor used for Altimeter. Thats atmospheric pressure. The other MAP sensor reads at intake. Thats engine and Atmospheric and is far more important for engine operation. We would need someone like TD or Evo to look at the programing of ECU and the map associated with that sensor to know if it has an effect and at what point it does. I asked them all and they are not into doing that.

I can say that I had a noticeable bog just off idle that I figured was due to old gas but after noticing the altimeter reading 70 ft above sea level I adjusted it to the correct elevation and the bog went away. Could be coincidence but who knows.

 

[Mtnviper]

The reading will vary with as the weather changes, due to a change in barometric pressure. I've had a couple different sleds range from about 70 to 500 feet depending on what the current barometric pressure was at the time I calibrated it. Never had it be off by 2000' though.
Looking at the wiring schematic, they do have a separate ambient pressure or baro sensor. So it's possible that your baro sensor may be slightly out of range.